1115.Replace text in multiple files -- How to remove all paragraphs(lines) that only contain single sentence?

I would like to manipulate a bunch of text files. I would like to accomplish the following: 1. Extract all the paragraphs from each text 2. Output each text file into new file 3. Output files must ONLY contain paragraphs 4. Output files must NOT contain single lines, titles (first line), bullet texts. I essentially want to clean up the existing text files and create only paragraphs from them.

Input Sample:

How is Arthritis Usually Treated?

For most patients, arthritis is treated with pain medications as well as medications that help to reduce the amount of inflammation in the joints. By adding physical therapy and other forms of activity as well, you can increase the mobility of the joints without causing more harm to them in the process.

In extreme cases of arthritis in which the joint is severely damaged, the joint may need to be replaced entirely.

Output Sample:

For most patients, arthritis is treated with pain medications as well as medications that help to reduce the amount of inflammation in the joints. By adding physical therapy and other forms of activity as well, you can increase the mobility of the joints without causing more harm to them in the process.